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F. R. ROBINSON.

CALCULATING DEVICE. APPLICATION F|LED MAY I, 1920.

1,409,583. Patented Mar. 14, 1922..

' UNITED STATES PATENT OFFIC.

FREDERICK R. ROBINSON, OF DETROIT, MICHIGAN, ASSIGNOR TO PACKARD MOTOR CAR COMPANY, F DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

CALCULATING DEVICE.

Specification of Letters Patent.

Application filed May '1, 1920. Serial No. 378,116.

To all whom it may concern:

Be it known that I, FREDERICK R. ROBIN- soN, a citizen of the United States, and resi- When a job is assigned to a workman, a

certain time is allowed for completing the job and if it is completed in less than the allowed time the wo-rkman is entitled to a premium varying in amount with the time saved. Suppose for instance, a man is allowed 16 hours for a certain job and completes the job in 12 hours. I-Ie saves 4 hours or one-quarter of the time allowed, and accordingly his pay will be increased 25% for sults as those obtained the time worked. If he is paid vat the rate of 80 per hour he will receive for the job 80 times 12 orv $9.60 for the12 hours worked and one quarter of $9.60 or $2.40 premium, making a total of $12.00.

The premium may be computed in another way by multiplying the time worked by the time saved and dividing the result bythe time allowed and this formula will give the premium hours. For the problem above stated the formula will be worked out by multiplying 12 (time worked) by 4 (time saved) and dividing the result by 16 (time allowed) giving as a. result 3 premium hours. The pay for 3 premium hours at 80 per hour will give $2.40 premium or the same amount as computed above. The same reabove may be obtained by logarithmic tables and such tables have been used the device embodying my invention. 'i

The object of the invention is to facilitate the computation of premiums under a sysT tem such as that outlined above and to enable the operator of the device to quickly and accurately determine the premium hours.

Further objects will appear as the description proceeds.

One embodiment of the invention has been illustrated in the accompanying drawings and in these drawings:

Figure 1 is an elevational view, partly in section; illustrating the calculating device in one position of adjustment of the movable members; j

Figure 2 is a view, inside elevation of the device shown in Figure 1;

Figure 3 is a detail view on an enlarged scale showing the means for locking the two rortable wheels against relative movement; an

Figure 4`is a perspective view showing a. portion of the movable members rotated to a sufficient angle to enable the operato-r to read the result in premium hours.

In the embodiment of the invention illustrated, the calculating device comprises a base 10 and a pair of upright standards 11, the standards 11 being rigidly secured to the base and being secured to each other by means of transverse bracing rods 12. Each of the supporting standards 11 is provided with an opening 13 and in these openings are journaled shafts 14, 15 to which are fixedly secured, as by pins 16 wheels 16. Each of the wheels 16 carries on its periphery a logarithmic scale 17, the scales 17 being exactly alike on the two wheels and being disposed adjacent the inner edges of the Wheels whereby they abut each other. j

Means is provided for locking one ofthe shafts and its wheel 16 against relative movement with respect to the other shaft and wheel and this means in the particular embodiment of the invention illustrated,4

comprises a sleeve 18 slidably mounted on the hollow shaft 15 and having a lug 19 extending inwardly through a slot 20 in the hollow shaft 15. The lug 19` carries at'its inner end a beveled locking member 21 and this member is adapted to enga e a conical or beveled surface 22 formed on t e shaft 14, when the sleeve 18 is moved on the hollow shaft 15.

Eachof the-logarithmic scales 17 carried by the wheels 16 serves two uses in the computation of the premium hours and in order to readily indicate to the operator the successive uses or functions of the scale I have provided a are in this instance positioned adjacent the peripheries of the wheels or adjacent the pair of indicators 23, 23 which scales. The indicator 23 is fixed to the standards 11 and indicator 23 ispivotally mounted upon a pivot 24. It will be understood that both sets of indicia could be made on the pivotedindicator, one on each face thereof,'if desired. When the two wheels and shafts are free to rotate with respect to each other, the left hand scale (see Figure 1) represents the standard hours or time allowed for a job and the right hand scale represents the elapsed 'hours or time consumed on a job. When these two scales have been set in a position in which the number of standard hours on the left hand scale is disposed opposite the elapsed hours or time consumed on the right hand scale, the sleeve 18 is moved on the hollow 'shaft 15 to a position in which the locking member 2l engages the conical surface 22 on the shaft 14 and locks these shafts and wheels against relative movement with respect to each other. After the wheels have been so locked the t wo scales are utilized to indicate different units, namely gained hours for the left hand scale and premium hours for the right hand scale. The indicator 23 may be moved by hand, as desired, or in order to readily indicate the change in the uses of the two scales I may provide connecting means between the sleeve 18, by means of which the locking mechanism is operated, and the indicator 23. This form of connecting means illustrated comprises a lever 24, pivoted between a pair of lugs 25 carried by one of the supporting standards 11. The lower end of the lever 24 is bifurcated and engages a channel 26 formed in the sleeve 18 and the upper end of this lever is provided with a roller 27. The roller 27 is engaged by a cam 28 formed on a lever 29 pivoted at,30 to one of the supporting standards 11. This lever 29 is operatively connected to the pivoted indicator 23 by a rack 31, pivoted to the lever and engaging a pinion 32 secured to the indicator shaft 24. The lever 29 thus swings this indicator on its pivot as the sleeve 18 is moved into locking and unlocking position, the parts being so connected that when the sleeve 18 is in unlocking position the indicator 23 will designate the left hand scale as standard hours and the right hand scale as elapsed hours and when the sleeve isin its locking position the indicator 23 will design-ate the left hand scale as gained hours and the right hand scale as premium hours. A spring 32 returns lever 29 to its normal position after it has been actuated to swing the pivoted indicator and a. stop 33 limits the swinging movement of the lever 29. It will be seen, therefore, that the operation of the indicator 23 is made automatic with the manipulation of the locking mechanism lby means of which the shafts and wheels are locked Assuming that the standard time or time allowed is 16 hours, the left hand scale will be set with the number 16 opposite the number 12 on the right hand scale (12 being the elapsed hours or the time worked). When the wheels have been so adjusted the sleeve 18 is moved to a position in which the two shafts and wheels are locked against relative movement with respect to each other and this movement of the sleeve also swings the indicator 23 on its pivot to a position in which the two scales are indicated as gained hours'and premium hours. The difference between the time allowed or 16 and the time worked or 12 being 4, this represents the gained hours and reading against 4 on the left hand scale which indicatesthe gained hours we 4find 3 on `the right hand scale as indicating the' premium hours. It will be seen, therefore, that the calculating device gives the same result as that obtained by means of the other two methods described.

For convenience in illustrating the struc,- ture, the solution of another problem has been shown, since this problem does not necessitate the showing of as large a proportion of the logarithmic scale. In this problem as shown in Figure 1 the standard hours assumed is 6, the elapsed hours 3, making the gained hours 3. Referring to Figure 4 and working this problem in the manner just described we note the resulting premium hours as 1, 5-10.

In the device as actually built it will be `understood that the logarithmic scales run from 1 to 100, thereby giving a sufficient range for the solution of any problem.

Although the scales have been illustrated as mounted upon rotatable members, it will be evident that the invention is equally well adaptedto a device in which slide rules are utilized, having upon them the two scales which in this instance are mounted upon the peripheries of the wheels. It will also be evident that the locking means for locking the two scalesagainst relative movement is adapted for use in connection with such a construction and also the connection between the locking means and the indicator. It will be evident to those skilled in the art that other changes and modifications in the construction and in the arrangement of the cooperating parts may be made without departing from the spirit or scope of the invention and it is my intention to cover" such changes and modifications in the following claims.

What I claim and desire to secure by lLetters Patent is 1. A calculating machine comprising a pair of re atively movable members, means for locking said members against relative movement, a scale carried by each of said movable members and indicating means disposed adjacent said scales and adapted' to indicate different uses for the scales` in different positions of adjustment thereof.

2. A calculating machine comprising a pair of relatively rotatable members, means for locking said members against relative movement, a scale carried by each of said rotatable members and indicating means including an adjustable indicator disposed adjacent'said scales and adapted to indicate different uses for the scales in different positions of adjustment thereof.

3. A calculating machine `comprising a pair of relatively rotatable members, means for locking said members against relative movement, a scale carried by each of said rotatable members and indicating means including an adjustable indicator disposed adjacent said scales and adapted to indicate different uses for the scales in different positions of adjustment thereof, said indicator having tWo sets of indicia thereon so disposed that one set is visible to the operator in each osition of adjustment thereof.

4. A' calcu atingl machine, comprising a plurality of relatively rotatable members, means for locking said members against relative movement, a scale carried by each of said rotatable members and indlcating means including an indicator disposed adjacent saidV scales and adapted to indicate different uses for said scales in different positions of adjustment of said movable indicator.

5. A calculating machine comprising a pair of relatively movable members, means for locking said members against relative movement, a scale carried by each of said members, a movable indicator disposed adjacent said scales, and means connected to said locking means for adjusting said indicator.

6. A calculating machine comprising a pair of relatively movable members, means for locking said members against relative movement, a scale carried by each of said -eating means including a pivoted indicator disposed adjacent said scales and adapted to indicate diiferent uses for said scales in different positions of adjustment thereof, and means connected to said locking means for swinging said indicator upon its pivot.

8. A calculating machine, comprising a lpair of concentrically mounted relatively rotatable members, means locking said members against relative movement, a scale carried by each member on its periphery a movable indicator disposed` adjacent said scales, and means connected tosaid locking means for moving said indicator.

9. A calculating machine comprising a base, a pair'of supporting standards, a pair of shafts mounted in said standards, Wheels secured to said shafts, each of said Wheels having a scale on its periphery, a fixed indicator secured to said standards adjacent said Wheels, an indicator pivoted adjacent the periphery of said Wheels, and means for locking said Wheels and shafts against relative movement With respect to each other.

10. A calculating machine comprising a base, a pair of supporting standards, a pair of shafts mounted in said standards, Wheels 'secured to said shafts, each of said Wheels having a scale on its periphery, an indicator pivoted adjacent the periphery of said Wheels, and means foil locking said Wheels and shafts against relative movement with respect to each other.

1l. A calculating machine, comprising a pair of rotatable members, means for locking said members against relative rotation,

a logarithmic scale carried by the periphery of each of said members. said scales being exactly alike on the tvvo members, indicating means adjacent the peripheries of said rotatable members, means for locking said members against relative movement, and means for adjusting said indicating means to indi.

cate different uses for the scales.

FREDERICK R. RO INSON. 

